Our People

Our Management

Technical Team

Technical Associate

STJ Budi Santoso is a distinguished professional in the mining industry with over 26 years of experience, including leadership roles in global mining firms like Freeport-McMoRan and BHP Billiton. With a Master's in Economic Geology from the University of Tasmania, he has a proven track record in the discovery and development of key mineral deposits. Budi is recognized for his contributions as a member of the Australasian Institute of Mining and Metallurgy (AusIMM) and the Society of Economic Geologists (SEG). He served as the Chairman of the Indonesian Society of Economic Geologists (MGEI) from 2019 to 2024 and is currently the Chairman of the Indonesian Association of Geologists (IAGI) for the 2023-2026 term, reflecting his esteemed standing in the geology and mining community.

STJ Budi Santoso

Bowo Kusnanto brings more than 25 years of expertise to the resources sector, highlighted by a distinguished 15-year tenure in exploration management roles within renowned entities listed on the ASX and BEI, including Freeport Mc Moran, Zinifex, Perilya, Oxiana/MMG, Tiger Realm Minerals, J Resources, and Asiamet Resources. Holding a Bachelor's degree in Geology from UPN, Kusnanto has excelled in steering projects at various stages—from greenfield explorations to fully operational mines—both in Indonesia and internationally. His journey has not only encompassed significant achievements in the exploration and reporting of gold and copper but also extended to include substantial experience with nickel and bauxite exploration in Indonesia. His technical expertise and leadership have consistently yielded impactful results, solidifying his status as a recognized competent person in the exploration and reporting of these minerals.

Bowo Kusnanto

Gyaista Sampurno boasts an impressive career spanning over 25 years in the resources sector, with a significant tenure of 5 years as Chief and Principal Geologist at J Resources. A graduate of ITB in 1996, Sampurno has excelled in field-oriented and technologically adept exploration roles. His expertise is particularly notable in greenfield and brownfield explorations for Low Sulphidation Epithermal (LSE), High Sulphidation Epithermal (HSE), Porphyry, and Iron Oxide Copper Gold (IOCG) deposit types, primarily with Newmont and J Resources Nusantara. Sampurno's international experience further underscores his comprehensive understanding and capability in the geology field.

Gyaista Sampurno

Nur Tri Atmaji has over 20 years of experience in building and leading finance teams in large companies with significant operational scale and complexity. Previously, he held various positions at PT Petrosea Tbk, including GM Financial Controller, Statutory Reporting Manager, Senior Cost Control, Account Payable Superintendent, Senior Project Accountant, and Asset Accountant.
He oversees accounting, business support, financial planning and analysis, treasury, M&A, audit, and tax functions. He earned his Bachelor of Accountancy from Diponegoro University and a Master of Management in Finance from Pelita Harapan University.

Nur Tri Atmaji

David Iswanto is a field-oriented with rounded experience Geologist in Generative and Greenfields to Brownfields detailed Exploration work equipped with strong understanding of various gold, copper and base-metal deposit including Porphyry, High Sulphidation Epithermal, Intermediate Sulphidation Epithermal, Low Sulphidation Epithermal, Sediment Hosted, Skarn, Orogenic, mostly for gold, copper and other base-metal deposits. He has significant track record as part of Discovery Team at several prospects and significant contribution on incremental resources in several operation Gold Mines in Indonesia.

David Iswanto

Arief is a strong field-oriented senior geologist with 12 years of experience in mastering geological understanding, conceptualizing and executing exploration for complex deposits within greenfield, brownfield and advanced exploration programs. He is a part of the successful technical team at Pani Project, Doup, Bolangitang and the generative exploration program in J Resources.

Arief Eko Prihandoyo

Ahmad is a strong field-oriented senior exploration geologist with 12 year-round experience in exploration with strength in QAQC, generative exploration and technical due diligence for multi-commodity mostly for Nickel laterite, Bauxite and Coal.

Ahmad Hidayat

Febby Yudhi Pratama

Muhammad Riefaldy

Muhaemin B Sutami is an experienced mineral resource specialist with more than 15 years experience. He is a member of AusIMM and also a Competent Person Indonesia CPI-IAGI qualified resource estimation of primary gold of epithermal and intrusion related deposits. He also possesses broad commodity experience including precious metals, nickel laterite, bauxite, base metals and iron ore. He has extensive experience of mineral projects in Indonesia throughout resource estimation, mine geology, project feasibility study and been working in some companies in Indonesia e.g. Antam and J Resources.

Muhaemin B Sutami

Kartika Dwi Handayani is an experienced senior coal geologist with more than 25 years experience covering various roles both technical and managerial in major national and multinational mining companies and mining services companies. Her experience includes detailed technical exploration work in greenfields, brownfields, resource estimation, mine operation, exploration project management and complex technical due diligence. She is resource geologist, member of AusIMM and is a competent person under JORC code for coal Resource estimation reporting and sign-off.

Kartika Dwi Handayani

Saut is a senior mine and resource geologist with experiencing from greenfield to brownfield geologist exploration and project development with extensive in mine geology and mineral resource experience over the past 24 years with a solid background in mineral resources, mine production and project development in a small and large Au-Ag epithermal low sulphidation and Au orogenic, Au high nugget narrow vein deposits, Cu-Au porphyry deposits, Cu-Zn base metal deposits, iron ore deposits. He is familiar with Mineral Resource Estimation (Linear and Non-Linear Estimation) for Underground and Open Pit mining using Vulcan, Isatis and Supervisor mining software including estimation evaluations/review and audits, desktop study and due diligence. He has strong international assignments and has worked with Newmont, Oxiana, SRK, Quantitative Group, Evolution Mining and MMG. He is a competent person; CP (Geo) AusIMM for Mineral Resource Technical reporting for annual mineral resource report to ASX (Australia Stock Exchange).

Saut Simbolon, M.Sc.

Tomy is a senior metallurgist with more than 16 years of experience in gold and nickel commodities.